Add additional symbol kinds for current_function (#49)

* Add more symbol kinds to current_function

There's little reason not to want to display enums, structs, and
interfaces. They tend to be top-level in languages which define them, so
they aren't competing with anything, like some of the smaller symbol
kinds are.

The updated formatting of the conditions is to keep the line length low.

* Add `module` and `namespace` kinds

These are also generally top-level, and (based on admittedly limited testing)
don't interfere with other kinds.

* Mention included function kinds in docs

This will help people set `kind_labels` by giving them an exhaustive
list of kinds they need to set labels for.

* Extract valid kinds to a module-level array

As suggested by the initial PR review, this significantly improves
readability and maintainability.

* Fix invalid table syntax

Not sure why I thought table keys could be strings.

* Correctly check `v.kind`

(Why you don't commit to a PR branch even for minor things.)

Author: rileyshahar

README.md

@@ -52,6 +52,7 @@ call packager#add('nvim-lua/lsp-status.nvim')
 The plugin provides several utilities:
 ```lua
 update_current_function() -- Set/reset the b:lsp_current_function variable
+-- Shows the current function, method, class, struct, interface, enum, module, or namespace
 diagnostics() -- Return a table with all diagnostic counts for the current buffer
 messages() -- Return a table listing progress and other status messages for display
 register_progress() -- Register the provided handler for progress messages

doc/lsp-status.txt

@@ -103,7 +103,8 @@ config({config})                                   *lsp-status.config()*
                   accepted as the symbol currently containing the cursor.• 
                 • `current_function`: Boolean, `true` if the current function
                   should be updated and displayed in the default statusline
-                  component.
+                  component. Shows the current function, method, class,
+                  struct, interface, enum, module, or namespace.
                 • `indicator_errors` : Symbol to place next to the error count
                   in `status` . Default: '',• 
                 • `indicator_warnings` : Symbol to place next to the warning

lua/lsp-status/current_function.lua

@@ -9,6 +9,18 @@ local function init(_, config)
   _config = config
 end
 
+-- the symbol kinds which are valid scopes
+local scope_kinds = {
+ Class = true,
+ Function = true,
+ Method = true,
+ Struct = true,
+ Enum = true,
+ Interface = true,
+ Namespace = true,
+ Module = true,
+}
+
 -- Find current function context
 local function current_function_callback(_, _, result, _, _)
   vim.b.lsp_current_function = ''
@@ -18,7 +30,7 @@ local function current_function_callback(_, _, result, _, _)
 
   local function_symbols = util.filter(util.extract_symbols(result),
     function(_, v)
-      return v.kind == 'Class' or v.kind == 'Function' or v.kind == 'Method'
+      return scope_kinds[v.kind]
     end)
 
   if not function_symbols or #function_symbols == 0 then